JP2010218794A - Led automatic light dimming lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED automatic light dimming lighting system for saving energy by eliminating unnecessary light emission, by making illuminance of an object constant when photographing the object. <P>SOLUTION: This LED automatic light dimming lighting system 11 includes an LED light emitting part 12 using a plurality of LEDs 1-6 for emitting the visible light for illuminating the object, an LED light emission driving part 13 variable in the light emitting number of driving the LED light emitting part 12 for light emission, an illuminance level setting part 14 for setting an illuminance level of the object M, a light sensor 15 for detecting the illuminance of the object M, and a control part 17 for adapting an emitting light quantity to a set illuminance level of the object M by increasing-decreasing the LED light emitting number of the LED light emitting part 12, by performing light emission driving control of the LED light emission driving part 13 in response to a comparing result by comparing the illuminance level with illuminance detected by the light sensor 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an LED automatic dimming illumination device, and more particularly, to an LED automatic dimming illumination device that achieves constant object illuminance at the time of photographing a subject and is useful as an illumination device that saves energy. is there.

  For example, when a subject is photographed by a camera, a lighting device for illuminating the subject is frequently used in order to obtain a high-quality subject image.

  Such lighting devices employ thyristor-controlled incandescent lamps or light sources that use semiconductor light-emitting elements such as LEDs. In these cases, the amount of light emitted toward the subject is controlled appropriately. Otherwise, in the case of short-distance shooting, the illuminance of the subject is too bright and the balance with the ambient light is lost, and the image quality of the subject image is degraded and unnecessary energy is wasted.

  Further, in the case of long-distance shooting, there are inconveniences such that the illuminance of the subject is dark and the image quality of the subject image is lowered.

  Patent Document 1 that is a prior art document includes, as a technique related to the present invention, an LED that emits visible light, a brightness setting circuit that sets the brightness of the LED, and a signal that causes the LED to emit light. A light emission drive circuit for generating, a switching signal generation circuit for generating a signal for switching the LED between a light emission mode and a light reception mode, a light reception signal when the LED is in a light reception mode by the switching signal, and the brightness setting An LED automatic dimming device configured to control the light emission drive circuit according to the difference signal from the difference signal generating circuit, and a difference signal generating circuit that generates a difference signal from a setting signal from the circuit. Proposed.

  In the case of this Patent Document 1, since the LED is used as a light emitting source and a light receiving source, the configuration can be simplified, but when the LED is in a continuous light emitting state, this LED cannot be functioned as a light receiving source. It is not suitable as a lighting device used when photographing a subject.

JP 2008-300152 A

  The problem to be solved by the present invention is that there is no LED automatic dimming illumination device that can achieve constant object illuminance at the time of photographing a subject and can eliminate unnecessary light emission and save energy. .

  The present invention realizes constant object illuminance at the time of photographing a subject, eliminates unnecessary light emission and saves energy, and an LED light emitting unit using a plurality of LEDs that emit visible light for subject illumination; An LED light emission drive unit having a light emission adjustment function of the LED light emission unit, an illuminance level setting unit for setting the illuminance level of the subject, an optical sensor for detecting the illuminance of the subject, the illuminance level, and the optical sensor detect And a control unit that performs light emission adjustment control of the LED light emission drive unit so that the light emission amount of the LED light emission unit matches the set illuminance level of the subject according to the comparison result. Main features.

  According to the first aspect of the present invention, the illuminance level setting unit can simplify the setting of the illuminance level of the subject, and can achieve constant illuminance of the subject at the time of photographing the subject and eliminate unnecessary light emission to save energy. LED automatic dimming illumination device can be provided.

  According to the second aspect of the present invention, simply by setting the illuminance level of the subject by the illuminance level setting unit, the number of emitted LEDs is automatically increased or decreased to match the illuminance level of the subject for which the emitted light amount is set. Thus, it is possible to provide an LED automatic dimming / illuminating device that can achieve constant object illuminance and can eliminate unnecessary light emission from the LED light-emitting unit, thereby saving energy.

  According to the third aspect of the present invention, the illuminance level setting unit simply sets the illuminance level of the subject, and automatically increases or decreases the light emission current of each LED to set the illuminance level of the subject. It is possible to provide an LED automatic dimming illumination device that can be adapted, can achieve constant illuminance of the subject, and can eliminate unnecessary light emission of the LED light emitting unit, thereby achieving energy saving.

  According to the fourth aspect of the present invention, the illuminance level of the subject in which the light emission quantity is set by changing the on / off duty ratio of each LED simply by setting the illuminance level of the subject by the illuminance level setting unit. Therefore, it is possible to provide an LED automatic dimming / illuminating device that can achieve a constant subject illuminance and can eliminate unnecessary light emission from the LED light-emitting unit and save energy.

It is a schematic block diagram which shows the LED automatic light control illumination apparatus of Example 1 of this invention. It is a block diagram of the control part in the LED automatic light control illumination apparatus of the present Example 1. It is operation | movement explanatory drawing when the LED light emission part and a to-be-photographed object are short distance in the LED automatic light control illumination apparatus of the present Example 1. FIG. It is operation | movement explanatory drawing when the LED light emission part and a to-be-photographed object in the LED automatic light control illumination apparatus of a present Example 1 are medium distance. It is operation | movement explanatory drawing when the LED light emission part and a to-be-photographed object in the LED automatic light control illumination apparatus of the present Example 1 are a long distance. It is a schematic block diagram which shows the LED automatic light control illumination apparatus of Example 2 of this invention. It is explanatory drawing of the current control in the LED automatic light control illumination apparatus of the present Example 2. It is operation | movement explanatory drawing when the LED light emission part and a to-be-photographed object are short distance in the LED automatic light control illumination apparatus of the present Example 2. It is operation | movement explanatory drawing in case the LED light emission part and a to-be-photographed object in the LED automatic light control illuminating device of a present Example 2 are medium distance. It is operation | movement explanatory drawing in case the LED light emission part and a to-be-photographed object are long distances in the LED automatic light control illumination apparatus of the present Example 2. It is a schematic block diagram which shows the LED automatic light control illumination apparatus of Example 3 of this invention. It is explanatory drawing of duty ratio control in the LED automatic light control illumination apparatus of the present Example 3. It is operation | movement explanatory drawing when the LED light emission part and a to-be-photographed object are short distance in the LED automatic light control illumination apparatus of the present Example 1. FIG. It is operation | movement explanatory drawing when the LED light emission part and a to-be-photographed object in the LED automatic light control illumination apparatus of a present Example 1 are medium distance. It is operation | movement explanatory drawing when the LED light emission part and a to-be-photographed object in the LED automatic light control illumination apparatus of the present Example 1 are a long distance.

  The present invention is simple by setting the illuminance level of the subject by the illuminance level setting unit, and by adjusting the illuminance level of the subject by increasing or decreasing the number of LED light emission of the LED light emitting unit and setting the emitted light amount. An LED automatic dimming illumination device that realizes constant object illuminance during shooting and eliminates unnecessary light emission to save energy.

  With reference to FIG. 1 thru | or FIG. 5, the LED automatic light control illumination apparatus 11 which concerns on the Example of this invention is demonstrated.

  As shown in FIGS. 1 and 3, the LED automatic dimming illumination device 11 according to the first embodiment has, for example, six LEDs (light emitting diodes) 1 to 6 that emit visible light for illuminating the subject M as substrates. 19 includes an LED light emitting unit 12 arranged on the line 19 and six electronic switches including, for example, transistor circuits corresponding to the LEDs 1 to 6 that drive the LED light emitting unit 12 to emit light. An LED emission drive unit 13 to which each cathode is connected and the number of emitted LEDs 1 to 6 is variable, and an illuminance level setting (for example, bright, medium, dark, etc.) of the subject M is set. An optical sensor 15 that is disposed toward the subject M and detects the illuminance thereof, for example, using a phototransistor, and an amplification circuit 16 that amplifies a detection signal of the optical sensor 15. The illuminance level signal set by the illuminance level setting unit 14 is compared with the illuminance signal detected by the optical sensor 15, and the light emission drive control of the LED light emission drive unit 13 is performed according to the comparison result, and the LED A controller 17 that adjusts the illuminance level of the subject M by increasing or decreasing the number of LEDs emitted from the light emitting unit 12 and setting the amount of emitted light, and a direct current in which anodes are connected to the anodes of the six LEDs 1 to 6 and the cathodes are grounded. And a power source 18.

  Although not shown, the DC power source 18 is configured to supply power necessary for the operations of the LED light emission drive unit 13, the amplifier circuit 16, and the control unit 17.

  As shown in FIG. 2, the control unit 17 stores the illuminance level signal from the illuminance level setting unit 14, the illuminance level signal, and the illuminance signal detected by the optical sensor 15. And, for example, a comparison signal output unit 22 that outputs a pulse signal such as one, three, six, etc. according to the difference, and LED emission driving according to the pulse signal from the comparison signal output unit 22 And a control signal output unit 23 that outputs control signals for individually turning on and off the six electronic switches of the unit 13.

  For example, when the difference between the illuminance level signal and the illuminance signal detected by the optical sensor 15 is small, the comparison signal output unit 22 outputs one pulse signal, and the difference is medium. Three pulse signals are output, and when the difference is large, six pulse signals are output.

  The control signal output unit 23 outputs a control signal to the LED light emission drive unit 13 in accordance with each pulse signal from the comparison signal output unit 22.

  That is, the control signal output unit 23 controls to turn on an electronic switch connected to the LED 1 of the LED light emission drive unit 13 according to one pulse signal from the comparison signal output unit 22 and according to three pulse signals. The electronic switches connected to the LEDs 1 to 3 of the LED light emission drive unit 13 are turned on, and the electronic switches connected to the LEDs 1 to 3 of the LED light emission drive unit 13 are turned on according to six pulse signals.

  Next, operations and effects of the LED automatic dimming illumination device 11 according to the first embodiment will be described with reference to FIGS.

  When the LED automatic dimming illumination device 11 according to the first embodiment is used as, for example, an illumination device at the time of photographing the subject M with a camera, the photographer sets the illuminance level of the subject M to “medium” by, for example, the illuminance level setting unit 14 ”. The signal of the illuminance level is stored in the storage unit 21.

  On the other hand, an initial illuminance signal of the subject M detected by the optical sensor 15 is amplified by the amplifier circuit 16 and transmitted to the comparison signal output unit 22.

  The comparison signal output unit 22 compares the illuminance level signal with the illuminance signal from the optical sensor 15 and outputs a single pulse signal when the difference is small. The control signal output unit 23 When one pulse signal is input, the electronic switch connected to the LED 1 of the LED light emission drive unit 13 is turned on. Thereby, only LED1 of the said LED light emission part 12 light-emits, and the to-be-photographed object M is illuminated. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming illumination device 11 is effective when the distance between the LED light emitting unit 12 and the light sensor 15 and the subject M is short as shown in FIG. The illuminance of the subject at the time of shooting can be made constant, and unnecessary lighting of the other LEDs 2 to 6 of the LED light emitting unit 12 can be eliminated, thereby saving energy.

  Next, in the operation of the LED automatic dimming illumination device 11 according to the first embodiment described above, the comparison signal output unit 22 compares the illuminance level signal with the illuminance signal from the optical sensor 15. When it is determined that the difference is medium, three pulse signals are output, and when the three pulse signals are input, the control signal output unit 23 connects each of the electronic switches connected to the LEDs 1 to 3 of the LED light emission drive unit 13. Turn on the control. Accordingly, only the LEDs 1 to 3 of the LED light emitting unit 12 emit light and illuminate the subject M. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming illumination device 11 is effective when the distance between the LED light emitting unit 12 and the light sensor 15 and the subject M is a medium distance as shown in FIG. The illuminance of the subject at the time of shooting can be made constant, and unnecessary lighting of the other LEDs 4 to 6 of the LED light emitting unit 12 can be eliminated, thereby saving energy.

  Next, in the operation of the LED automatic dimming illumination device 11 according to the first embodiment described above, the comparison signal output unit 22 compares the illuminance level signal with the illuminance signal from the optical sensor 15. When it is determined that the difference is large, six pulse signals are output, and when the six pulse signals are input, the control signal output unit 23 is connected to the LEDs 1 to 6 of the LED light emission drive unit 13. Turn on the control. As a result, the LEDs 1 to 6 of the LED light emitting unit 12 emit light and illuminate the subject M with the maximum light amount. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming illumination device 11 is effective when the distance between the LED light emitting unit 12 and the light sensor 15 and the subject M is a long distance as shown in FIG.

  Next, an LED automatic dimming illumination device 11A according to Embodiment 2 of the present invention will be described with reference to FIGS.

  Since the LED automatic dimming / illuminating device 11A according to the second embodiment has the same basic configuration as the LED automatic dimming / illuminating device 11 according to the first embodiment as shown in FIG. It shows with a code | symbol.

  The LED automatic dimming / illuminating device 11A according to the second embodiment is different from the LED automatic dimming / illuminating device 11 according to the first embodiment described above with respect to the LED light emission driving unit 13A illustrated in FIG. 6 variable resistance circuits are incorporated so that the light emission currents flowing through the LEDs 1 to 6 can be increased or decreased in a constantly energized state, and the object M set by the illuminance level setting unit 14 is controlled by the control unit 17A. The illuminance level (for example, bright, medium, dark) is compared with the illuminance detected by the optical sensor 15, and the resistance values of the six variable resistance circuits in the LED light emission driver 13A in which the light emission current flows according to the comparison result. A control signal for controlling the current to change from large to medium to small is output, and the light emission current of each LED 1 to 6 is changed to small, medium and large, thereby setting the total light emission amount of each LED 1 to 6 Covered Illumination level of the body M (dark, medium, light either) is that it has to adapt to.

  In this case, the control unit 17A has a configuration similar to the control unit 17 as shown in FIG. 2, and the illuminance level of the subject M set by the illuminance level setting unit 14, for example, from the comparison signal output unit 22 (for example, , Bright, medium, and dark) and the illuminance detected by the optical sensor 15 is configured to output low level, medium level, and high level pulse signals, and the control signal output unit 23 can output the low level. A control signal for increasing the resistance values of the six variable resistance circuits according to the pulse signal, and a control signal for setting the resistance values of the six variable resistance circuits to the middle according to the intermediate level pulse signal. A configuration example of outputting a control signal for reducing the resistance values of the six variable resistance circuits according to the level pulse signal can be given.

  Next, the operation and effect of the LED automatic dimming / illuminating device 11A according to the second embodiment will be described with reference to FIGS.

  When the LED automatic dimming / illuminating device 11A according to the second embodiment is used as, for example, an illuminating device at the time of photographing a subject M by a camera, the photographer sets the illuminance level of the subject M to “medium” by, for example, the illuminance level setting unit 14. ”.

  At this time, when the difference between the illuminance level signal and the illuminance signal from the optical sensor 15 is small, the control unit 17A has six variable resistance circuits as described above. A control signal for increasing the resistance value is sent to the LED light emission drive unit 13B.

  As a result, the resistance values of the six variable resistance circuits of the LED light emission drive unit 13B become large, and the light emission currents of the LEDs 1 to 6 become small as shown in the upper column of FIG. Illuminate. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming / illuminating device 11A is effective when the distance between the LED light emitting unit 12 and the light sensor 15 and the subject M is short as shown in FIG. The illuminance of the subject at the time of shooting can be made constant, and the power consumption of each LED 1 to 6 can be reduced to save energy.

  Next, in the operation of the LED automatic dimming / illuminating device 11A according to the second embodiment described above, the control unit 17A compares the illuminance level signal with the illuminance signal from the optical sensor 15, and the difference between them. Is determined to be medium, a control signal for setting the resistance values of the six variable resistance circuits to medium is sent to the LED light emission drive unit 13B.

  As a result, the resistance values of the six variable resistance circuits of the LED light emission drive unit 13B become medium, and the light emission currents of the LEDs 1 to 6 become medium as shown in the column of FIG. Illuminate. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming / illuminating device 11A is effective when the distance between the LED light emitting unit 12 and the light sensor 15 and the subject M is a medium distance as shown in FIG. The subject illuminance at the time of shooting can be made constant, and the power consumption of each of the LEDs 1 to 6 can be reduced as compared with the case of full light emission, thereby saving energy.

  Next, in the operation of the LED automatic dimming / illuminating device 11A according to the second embodiment described above, the control unit 17A compares the illuminance level signal with the illuminance signal from the optical sensor 15, and the difference between them. Is determined to be large, the control unit 17A sends a control signal for reducing the resistance values of the six variable resistance circuits to the LED light emission drive unit 13B.

  As a result, the resistance values of the six variable resistance circuits of the LED light emission drive unit 13B become small, and the light emission currents of the LEDs 1 to 6 become large (full light emission) as shown in the lower column of FIG. Illuminate the subject M. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming / illuminating device 11A is effective when the distance between the LED light emitting unit 12 and the light sensor 15 and the subject M is a long distance as shown in FIG. The illuminance of the subject at the time of shooting can be made constant.

  Next, with reference to FIG. 11 thru | or FIG. 15, LED automatic light control illumination apparatus 11B which concerns on Example 3 of this invention is demonstrated.

  The LED automatic dimming illumination device 11B according to the third embodiment has the same basic configuration as the LED automatic dimming illumination device 11 of the first embodiment as shown in FIG. It shows with a code | symbol.

  The LED automatic dimming / illuminating device 11B according to the third embodiment is different from the LED automatic dimming / illuminating device 11 according to the first embodiment described above in that the LED light emission driving unit 13B has, for example, six always corresponding to the LEDs 1 to 6. An energization PWM (pulse width modulation) circuit is built in, and the on / off duty ratio of each LED 1 to 6 is variable, and the control unit 17B sets the illuminance level setting unit 14 of the subject M. The illuminance level (for example, bright, medium, dark) is compared with the illuminance detected by the optical sensor 15, and the duty ratio control (for example, duty) of the six PWM circuits of the LED light emission drive unit 13B is performed according to the comparison result. Ratio: small, medium, large (= 1), etc., is output, and the ON / OFF duty ratio of each LED 1 to 6 is changed to match the illuminance level of the subject M in which the total light emission amount is set Is that where the structure to.

  In this case, the control unit 17B has a configuration approximate to that of the control unit 17 as shown in FIG. 2, and the illuminance level of the subject M set by the illuminance level setting unit 14 from the comparison signal output unit 22 (for example, , Bright, medium, dark) and a configuration for outputting low-level, medium-level, and high-level pulse signals according to the difference between the illuminance detected by the optical sensor 15, and the control signal output unit 23 allows the low-level The duty ratio of the six PWM circuits is made small as shown in the upper column of FIG. 12, and the duty ratio of the six PWM circuits is changed to the middle column of FIG. An example of a configuration in which a control signal that outputs a full (= 1) duty ratio of six PWM circuits in accordance with the high level pulse signal as shown in the lower column of FIG. 12 can be given. That.

  Next, operations and effects of the LED automatic light control lighting device 11B according to the third embodiment will be described with reference to FIGS.

  When the LED automatic dimming illumination device 11B according to the third embodiment is used as, for example, an illumination device at the time of photographing the subject M by a camera, the photographer sets the illuminance level of the subject M to “medium” using the illuminance level setting unit 14, for example. ”.

  At this time, the control unit 17B compares the illuminance level signal with the illuminance signal from the optical sensor 15, and if the difference is small, as is clear from the above, Control signals that reduce the duty ratio are sent to the six PWM circuits.

  Accordingly, the six PWM circuits of the LED light emission drive unit 13B operate in a state where the duty ratio is small, and each of the LEDs 1 to 6 illuminates the subject M with a small light emission amount. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming illumination device 11B is effective when the distance between the LED light emitting unit 12 and the optical sensor 15 and the subject M is short as shown in FIG. The illuminance of the subject at the time of shooting can be made constant, and the power consumption of each LED 1 to 6 can be reduced to save energy.

  Next, in the operation of the LED automatic dimming illumination device 11B according to the third embodiment described above, the control unit 17B compares the illuminance level signal with the illuminance signal from the photosensor 15, and the difference between them. When it is determined that the medium ratio is medium, as is clear from the above description, control signals indicating that the duty ratio is medium are sent to the six PWM circuits of the LED light emission drive unit 13B.

  As a result, the six PWM circuits of the LED light emission drive unit 13B operate in a state where the duty ratio is in mid-range, and each of the LEDs 1 to 6 illuminates the subject M with a medium light emission amount. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming / illuminating device 11B is effective when the distance between the LED light emitting unit 12 and the light sensor 15 and the subject M is short as shown in FIG. In this case, the power consumption of the LEDs 1 to 6 can be reduced as compared with the case of full light emission, and energy saving can be achieved.

  Next, in the operation of the LED automatic dimming illumination device 11B according to the third embodiment described above, the control unit 17B compares the illuminance level signal with the illuminance signal from the photosensor 15, and the difference between them. Is determined to be large, as is clear from the above description, a control signal that makes the duty ratio full (= 1) is sent to the six PWM circuits of the LED light emission drive unit 13B.

  Accordingly, the six PWM circuits of the LED light emission drive unit 13B operate in a state where the duty ratio is full, and each of the LEDs 1 to 6 illuminates the subject M with a large light emission amount. The above operation is continuously repeated.

  Such an operation of the LED automatic dimming illumination device 11B is effective when the distance between the LED light emitting unit 12 and the optical sensor 15 and the subject M is a long distance as shown in FIG. The illuminance of the subject at the time of shooting can be made constant.

  In addition, each structure of the LED automatic light control illuminating devices 11, 11A, and 11B of the first to third embodiments is configured such that, for example, the setting of the illuminance level and the lighting by the shutter operation are interlocked by a signal from a camera (not shown). You can also

  The present invention can be widely applied as an illumination device for various photographing apparatuses such as a digital camera, a video camera, and a still camera.

1-6 LED
DESCRIPTION OF SYMBOLS 11 Automatic light control illumination apparatus 11A Automatic light control illumination apparatus 11A Automatic light control illumination apparatus 12 LED light emission part 13 LED light emission drive part 13A LED light emission drive part 13B LED light emission drive part 14 Illuminance level setting part 15 Optical sensor 16 Amplifying circuit 17 Control Unit 17A Control unit 17B Control unit 18 DC power source 19 Substrate 21 Storage unit 22 Comparison signal output unit 23 Control signal output unit M Subject

Claims (4)

An LED light emitting unit using a plurality of LEDs that emit visible light for subject illumination;
An LED light emission drive unit having a light emission adjustment function of the LED light emission unit;
An illuminance level setting section for setting the illuminance level of the subject;
An optical sensor for detecting the illuminance of the subject;
Comparing the illuminance level with the illuminance detected by the light sensor, and adjusting the light emission adjustment of the LED light emission drive unit so that the light emission amount of the LED light emission unit matches the set illuminance level of the subject according to the comparison result A control unit for performing
LED automatic dimming illumination device characterized by having. An LED light emitting unit using a plurality of LEDs that emit visible light for subject illumination;
A light emission number variable LED light emission drive unit for driving the LED light emission unit;
An illuminance level setting section for setting the illuminance level of the subject;
An optical sensor for detecting the illuminance of the subject;
The illuminance level is compared with the illuminance detected by the optical sensor, and the light emission drive control of the LED light emission drive unit is performed according to the comparison result, and the light emission quantity is set by increasing or decreasing the number of LED light emission of the LED light emission unit. A control unit adapted to the illuminance level of the subject
LED automatic dimming illumination device characterized by having. An LED light emitting unit using a plurality of LEDs that emit visible light for subject illumination;
A light emission current variable LED light emission drive unit for driving the LED light emission unit;
An illuminance level setting section for setting the illuminance level of the subject;
An optical sensor for detecting the illuminance of the subject;
The illuminance level is compared with the illuminance detected by the optical sensor, and the light emission drive control of the LED light emission drive unit is performed according to the comparison result, and the light emission amount is increased or decreased by increasing or decreasing the light emission current of each LED of the LED light emission unit. A control unit adapted to the illuminance level of the subject for which
LED automatic dimming illumination device characterized by having. An LED light emitting unit using a plurality of LEDs that emit visible light for subject illumination;
LED on / off duty ratio variable LED light emission drive unit for driving the LED light emission unit,
An illuminance level setting section for setting the illuminance level of the subject;
An optical sensor for detecting the illuminance of the subject;
The illuminance level is compared with the illuminance detected by the light sensor, and the light emission drive control of the LED light emission drive unit is performed according to the comparison result, and the duty ratio of each LED in the LED light emission unit is changed. A control unit adapted to the illuminance level of the subject for which the emitted light amount is set,
LED automatic dimming illumination device characterized by having.

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